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API · /beerlambert-api

Beer-Lambert Spectroscopy API

healthy 3,983 Subscribers

Beer–Lambert spectroscopy maths as an API, computed locally and deterministically. The beer-lambert endpoint applies the law A = ε·c·l, where absorbance equals the molar absorptivity times the concentration times the optical path length: give any three of the four and it solves for the fourth (the path length defaults to the standard 1 cm cuvette when omitted), and it always reports the matching transmittance and percent transmittance. The transmittance endpoint converts between absorbance and transmittance in both directions, A = −log₁₀(T) and T = 10^(−A), and accepts a fraction or a percentage. The calibration endpoint reads a concentration off a linear calibration curve, A = slope·c + intercept, solving for the concentration from a measured absorbance or for the expected absorbance from a concentration. Units are whatever you supply consistently — for molar absorptivity in M⁻¹cm⁻¹, a path length in cm and absorbance dimensionless, the concentration comes out in molar. Everything is computed locally and deterministically, so it is instant and private. Ideal for analytical-chemistry and lab tools, spectrophotometer and assay apps, biotech and education software, and quality-control calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is Beer–Lambert spectroscopy; for solution dilution and molarity use a dilution API and for chemical compound data use a chemistry API.

#beer-lambert #spectroscopy #absorbance #chemistry #analytical #developer-tools
api.oanor.com/beerlambert-api
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/api/beerlambert-api/openapi.json
/api/beerlambert-api/llms.txt

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API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
93 ms
Server probes · 24h
Subscribers
3,983
active
Total calls
36
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 2,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • A = e.c.l absorbance from molar absorptivity, concentration, path length
  • Solve for any single variable (A, e, c, or l)
  • JSON in/out, deterministic instant compute
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Starter

€5.00 /month

  • 25,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • All Beer-Lambert solve directions
  • %T <-> absorbance conversion helper
  • SI + cm/M unit handling
  • Email support
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Pro

€15.00 /month

  • 150,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • Batch absorbance calc for spectral series
  • Multi-component additive absorbance (sum of e.c.l)
  • Calibration-curve concentration back-solve
  • 99.9% uptime SLA
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Mega

€49.00 /month

  • 750,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • High-throughput batch endpoints for LIMS pipelines
  • Path-length and dilution correction chains
  • Priority support
  • Volume call pricing
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api.oanor.com/colligative-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Beer-Lambert Spectroscopy API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Beer-Lambert Spectroscopy API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Beer-Lambert Spectroscopy API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Beer-Lambert Spectroscopy API cost?
Beer-Lambert Spectroscopy API has a free tier with 100 calls / month. Paid plans start at €5.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Beer-Lambert Spectroscopy API GDPR-compliant?
All requests to Beer-Lambert Spectroscopy API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/beerlambert-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/beerlambert-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/beerlambert-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/beerlambert-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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